Magento 2: compile - Class Not_Existing_Class does not exist

Question

I have below error while I am compiling the Magento Store. it took very long time and finally gave this error.

php bin/magento setup:di:compile

Answer 1

Update setup/src/Magento/Setup/Module/Di/Code/Reader/ClassesScanner.php

if (preg_match($pattern, $fileItem->getRealPath())) {

to

if (preg_match($pattern, str_replace('\\', '/', $fileItem->getRealPath()))) {

Check this Link, Fixed by Magento.